Pholadidæ (foladide)

pl. [NL., IMG:content-0041.jpg:[graphic] united and everted upon the umbonal region, long siphons with fringed orifices, narrow branch iæ prolonged into the branchial siphon, and a short truncated foot. The shell is gaping and sinupalliate, without hinge or ligament, and besides the pair of large valves there are small acce ory valves near the umbones. The family formerly included Teredo, now made the type of Teredinidæ. The species are generally cla ed under at least 8 genera, and occur in various parts of the world, generally boring into stone or wood. See cuts under acce ory and piddock.